Hot-air furnace



A. B. MCADAM.

HOT AIR FURNACE.

APPLICATION FILED IIIAYIs. 1921.

Patented Dec. 13, 1921.

III@

UNITED STATES PATENT OFFICE.

ALFRED BUCHANNAN MUADAM, OF MOOSE J AW, SASKATCHEWAN, CANADA.

Hor-AIR FURNACE.

Application filed May 13,

To all whom t may concern:

Be it known that I, ALFRED BUCHANNAN MGADAM, a subject of the King of Great Britain, residing at the city of Moose Jaw, in the Province of Saskatchewan and Dominion of Canada, have invented certain new and useful Improvements in Hot-Air Furnaces, of which the following is a specification.

This invention relates to improvements in hot air furnaces, and the object of the invention is to provide simple and eective means for effectin a transfer of heat from the hot gases arising from the lire to the circulating air olf the furnace.

A further object is to provide storage for a certain proportion of the heat, which will enable more uniform heating of the hot air to be effected.

Further objects are to generally simplify and improve the construction of the device to better adapt it to perform the functions required of it and obtain increased economy in heating.

It consists essentiallyv of the improved construction hereinafter described in detail in the accompanying specification and drawing.

In the drawing: Y

Figure 1 is an elevation of an embodiment of the invention.

Fig. 2-is a sectional elevation.

Fig. 3 is a section taken longitudinally through one of the flues.

A represents the fire pot, B an inner cas ing and C an outer casing, the innerand outer casings being spaced a distance apart to constitute a chamber D for the circulating air.

The fire pot A may be of any suitable or convenient design having ay grate 10, a charging door 11 and ash pit door 12.

he products of combustion from the fire are adapted to rise through the upper part of the casing B to the discharge pipe 13. In accordance with the present invention this upper part of the casing B is adapted to constitute a heat transferring chamber E which is partially filled with a plurality of metallic balls or baffles 14C of a heat absorbing character such as cast iron, which are supported at the bottom by a plurality of parallel and spaced pipes 15 conveniently constructed of cast iron and which are inclined and extend from one side of the casing B to the other. In this way the cooler air will enter the Patented Dec. 13, 1921.

1921. Serial No. 469,278.

lower end of the pipes and pass out at the upper end. The pipes are sufliciently close together to enable them to support the balls 14;. An additional support to the balls may be given by inclined plates 16 and 17 at the sides of the chamber E.

In the upper part of the chamber E a plurality olf pipes 18 are provided. These pipes are of larger diameter than the pipes 15 and -extend at an inclination to the horizontal from one side of the casing B to the opposite side. I have shown three of these pipes with the central one arranged below the side ones whereby they will be in staggered relation. It will be seen that the air from one side of the chamber B will enter the lower part of the pipes 18 and be heated and pass out at the upper end. The balls 14 will absorb the heat from the hot gases and thus effect equalization in the heating of the air, the balls giving out their heat whenever the fire dies down or slackens. In addition to the pipes 15, a central conduit 19 may be provided having straight sides and being extended from one side of the casing B to the other.

As many changes could be made in the above construction and many Widely different embodiments of my invention within the scope o f the claims, constructed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawing shall be interpreted as illustrative and not in a limiting sense.

While the baffles in the heat transferring chamber E are shown in the form of metallic balls, it will be understood that balls or bafies of any suitable material which will stand heat may be used.

'What I claim as my invention is z- 1. A hot air furnace comprising a fire pot, an inner and outer casing in spaced relationship to each other, a heat transferring chamber within the upper part of the inner ca'sing, a plurality of metal balls therein, a plurality of parallel and spaced pipes inclined horizontall and adapted to support said balls, a series of pipes in the upper part of said heat transferring chamber suitably inclined and extending from one side of the casing to the other in staggered relationship to one another, a chimney leading from said inner casing, and a transversely extending central conduit in said inner casing.

2. In a hot air furnace of the character described, a. fire pot and an inner and outer casing, an air chamber Jformed b-y said casing, a heat transferring chamber containing a plurality of conduits arranged in series and having therebetween a plurality of heat absorbing balls whereby the heat is transmitted through the lower series o said conduits to heat the balls and in turn circulate through the upper series of conduits in superheated form for distribution.

In witness whereof I have hereunto set my hand in the presence of two Witnesses.

ALFRED BU'CHNNAN Il'lcADM.

Vit-nesses i KATHIEEN MOADAM, J. B. HAIG. 

